3Com Cable Modem External - Manual (Page 25)

Troubleshooting the USB Installation 21
d After the system releases the IP address, at the
command prompt type ipconfig /renew and press the
Enter key (notice that there is a space between ipconfig
and /renew).
e Exit the Command Prompt screen to return to the
Windows desktop.
The Cable Status LED never stops blinking.
The signal from your cable service provider’s equipment
may be too weak or the cable line may not be properly
attached to the modem. If the cable line is properly
connected to the modem, call your cable service provider
to verify whether a weak signal is the problem.
All four of the LEDs on the front of my cable modem
are lighted and blinking.
Call your cable service provider or 3Com’s technical support
for assistance.